CN1053714C - Far infrared fiber with good spinning property and its manufacture - Google Patents

Abstract

The invention relates to a far infrared fiber. It is characterized by adding far-infrared ceramic powder with an average particle diameter between 0.05 and 1 μm, and the weight of particles with a particle diameter greater than 2 μm is less than 5% of the total weight of the powder, and adding 4% of the weight of the far-infrared ceramic powder to the fiber-forming polymer. ~8% of spinning aids to prepare far-infrared fibers with good spinnability. The obtained fiber can be made into various far-infrared health products by conventional methods.

Description

A kind of far-infrared fiber with good spinnability and its manufacturing method

The invention relates to a functional fiber, specifically a method for manufacturing a far-infrared fiber sheath.

In addition to the role of conventional fibers, far-infrared fibers have been confirmed by physics and medical research to have health care and therapeutic effects on the human body, so they have become a research and development hotspot in chemical fiber manufacturing and textiles.

Far-infrared fiber has seen multiple patent applications both at home and abroad, such as Patent No. 1-24837, which introduces the idea of adding far-infrared micro-energy radioactive powder in chemical fibers; CN1052712A patent reports replacing other similar products on the basis of the above-mentioned patents. The idea of the far-infrared micro-energy radiation synthetic fiber of the additive; CN1081475A also discloses the synthetic fiber that " adds far-infrared ceramic powder in base material " and makes. But they all avoid the essential property of being a fiber - spinnability. That is to say, simply giving the addition of far-infrared emitting substances and their content or particle size in the polymer cannot spin the mixture into fibers in an industrial sense, or make far-infrared fibers with popularization and practical value.

The purpose of the present invention is to produce a far-infrared fiber with good spinnability, smooth spinning, easy spinning, simple needle and weaving, and has practical value.

The object of the present invention is achieved like this; Except adding the far-infrared ceramic powder that has efficient room temperature far-infrared emission in conventional fiber-forming polymer, also add spinning aid in particular, also to the average particle of far-infrared ceramic powder simultaneously The diameter and particle diameter distribution are strictly controlled, that is, the average particle diameter of the far-infrared ceramic powder is required to be between 0.02 and 2 μm, preferably between 0.5 and 1 μm, and the total weight of particles with a diameter above 2 μm should be less than that of the added 10% by weight of the far-infrared ceramic powder, preferably less than 5%. Because the far-infrared ceramic powder with a particle diameter greater than 2 μm is easy to block the spinneret hole during spinning, resulting in broken filaments, making spinning difficult.

Due to the limitation of the processing method and process conditions of the far-infrared ceramic powder, the particle diameter distribution of the far-infrared ceramic powder prepared by the usual method is relatively wide. If it is used directly indiscriminately, it will affect the fiber-forming polymer and the far-infrared ceramic powder. The spinnability of the mixture, especially the number of particles with a diameter above 2 μm, will directly affect the spinnability of the fiber. This is not mentioned in the disclosed invention.

In order to make the fiber-forming polymer mixed with far-infrared ceramic powder have good spinnability, the surface of far-infrared ceramic powder has been treated with spinning aid among the present invention, and its purpose is in order to improve the fiber-forming polymer molecular chain and Miscibility between far-infrared ceramic powder particles. The so-called spinning aid refers to at least two kinds of substances such as titanate series, silane series, stearate series and polyethylene wax, wherein the titanate series includes isopropyl triisostearate titanate, Isopropyl isostearyl-methacryl titanate, etc., the silane series include bis-(r-triethoxysilylpropyl) tetrasulfide, r-mercaptotrimethoxysilane, r-methyl Acryloyltrimethoxysilane, r-glycidoxytrimethoxysilane and r-aminopropyltriethoxysilane, stearate series include stearic acid, glyceryl monostearate and glyceryl tristearate Etc. The added amount of the spinning aid is 1-10% of the weight of the far-infrared ceramic powder, preferably 2-9%, most preferably 4-8%. If the amount of spinning aid is too small, the desired effect will not be achieved, and if the amount is too large, it will cause waste of spinning aid and decrease in spinnability.

There are many ways to mix the far-infrared ceramic powder and the spinning aid, either by directly adding the spinning aid to the far-infrared ceramic powder and then stirring evenly, or by dissolving the spinning aid into the dispersant first , and then mixed with far-infrared ceramic powder. The advantage of the latter method is that it can ensure that the spinning aid is evenly coated on the surface of the far-infrared ceramic powder particles, and it is best to adopt the latter method to realize the purpose of the present invention. Said dispersant is a conventional low-boiling organic solvent such as acetone and ethanol, so the low-boiling organic solvent is used as a dispersant in order to enable the dispersant to be easily removed by volatilization during the stirring process without having to Heat the mixture.

In the present invention, the mixing method between the fiber-forming polymer and the far-infrared ceramic powder depends on the type of polymer. For the addition polymer, the screw melt mixing method is usually used, while for the condensation polymer, the addition of polymerizable monomers is often used. The post-polymerization method of far-infrared ceramic powder is used to realize this mixing process.

The fiber-forming polymer used in the present invention can be any linear thermoplastic polymer with a sufficiently high molecular weight, such as polyethylene, polypropylene, polycaprolactam, polydecanediamine adipate, polyhexamethylene adipate, and polyhexamethylene adipate. Ethylene terephthalate, etc., and copolymers mainly composed of the above-mentioned polymers, etc.

Composition of far-infrared ceramic powder is iron oxide, alumina, mullite, cordierite, zirconia, titanium oxide, magnesium oxide, silicon oxide, chromium oxide, nickel oxide, boron carbide, boron nitride, silicon nitride At least one of the substances with high far-infrared emissivity at room temperature.

The content of far-infrared ceramic powder in the fiber preferably accounts for 1～60% of fiber weight, preferably accounts for 2～50%, and the content of far-infrared ceramic powder is lower than 1%, and then fiber is difficult to have the performance of object of the present invention , and the content is greater than 50%, it will cause the decline of fiber spinnability, and the deterioration of fiber performance.

The far-infrared fiber of the present invention can be spun by a conventional method or an unconventional method under similar process conditions to common chemical fiber forming conditions.

When spinning with the method of the present invention, the spinnability of the mixture of fiber-forming polymer and far-infrared ceramic powder is significantly improved, and the normal service time of the spinneret is more than double that of the common far-infrared fiber spinning method, and has better industrial production value.

The present invention is described in more detail with examples below, and the scope of the present invention is not limited by examples.

Example 1 Dissolve 0.8 parts of isopropyl triisostearate titanate and 0.4 parts of r-aminopropyl triethoxysilane into 20 ml of acetone, and add to the In 30 parts of a mixture of alumina, mullite, magnesia and cordierite (weight ratio 30:30:20:20) whose particles account for 5% of the total weight, first stir for 20 minutes in an airtight high-speed mixer; then add 68.8 parts of polypropylene with a melt index of 24 were stirred at high speed again, melted and kneaded once at 220°C on a Ф30 twin-screw extruder to make pellets, and the pellets were vacuum-dried for spinning.

The above-mentioned dry pellets are melt-spun on a spinneret of φ160 (the number of holes is 300, and the diameter of the hole is 0.35mm) in a Ф45 single-screw extruder at 260°C with a pump supply rate of 160g/Min. The speed is 800 meters/min, and the fineness of winding yarn is 6.6dTex. The normal time of the spinneret is about 30 hours on average, and the number of broken filaments is less than 2 per hour. Bundled into large tows of 200,000 dtex, stretched 2.3 times in a water bath at 65-68°C, and stretched 1.74 times in a steam bath at 110°C, and cut into short fibers of 36mm after conventional crimping and drying. The fineness of the finished fiber is 1.64dTex, the fiber normal temperature tensile breaking strength is 2.7CN/dTex, and the breaking elongation is 32%.

The fiber can be processed into knitted fabrics, woven fabrics or non-woven fabrics after spinning under conventional processing conditions.

Example 2 Add 70 parts of polypropylene with a melt index of 24 to 30 parts of dry pellets prepared in Example 1, mix them uniformly, put them into a φ45 screw extruder, and use eight-position φ60 at 265°C (24 holes, diameter 0.35) spinneret, melt-spun into 1.6dTex polypropylene fiber low elastic filament with the pump supply rate of 102.4g/Min. The normal use time of the spinneret is 42 hours, and the number of broken filaments is less than 1 per hour. The tensile breaking strength of the single fiber is 2.9CN/dTex, the breaking elongation is 31%, and the elastic recovery rate is 14%. The fiber can be processed into knitted underwear and socks by conventional technology.

Example 3 In 10 parts of a mixture of titanium oxide, magnesium oxide and zirconium oxide (weight ratio is 49:21:30) with an average particle size of 0.05 microns and particles with a diameter above 2 μm accounting for 3% of the total weight, add Dissolve 0.5 parts of r-methacryloyl trimethoxysilane and 0.3 parts of stearic acid in 10 ml of ethanol to prepare a solution, add it to the mixture powder of titanium oxide, magnesium oxide and zirconium oxide above, and mix in a closed high-speed In a mixer, stir at high speed to mix well. Then add 60 parts of ethylene glycol to the mixture powder, stir at a low speed to make a mixed solution.

Add 195 parts of dimethyl terephthalate, 144 parts of ethylene glycol and all the above mixed solutions into the polycondensation reaction kettle, and then add 0.09 parts of zinc acetate powder as a catalyst, and carry out transesterification reaction at 180-200 ° C under stirring 3.5 ~ 4 hours, then raise the temperature to 230-240°C and continue the reaction for 1.5-2 hours, add 0.078 parts of antimony trioxide and 0.05 parts of triphenyl phosphite, stir and heat up to 250-260°C, and reduce the pressure to the pressure in the kettle. Distill at 5-6KPa until no liquid distills out, then raise the temperature to 270-285°C, reduce the pressure to 60-70Pa in the kettle, and keep it for 1.5-2 hours. Pressurize and squeeze into water, inject strips, cut off, vacuum dry until the moisture content reaches below 0.02%, put it into a φ60 screw extruder, and use eight-position φ60 (24 holes, diameter 0.30) spinnerets at 285°C , melt-spun into 3.2dTex polyester low-elastic filaments with a pump feed rate of 204.8g/Min. The normal use time of the spinneret is 28 hours, and the number of broken filaments is less than 2 per hour. The tensile breaking strength of the single fiber is 2.6CN/dTex, the breaking elongation is 30.8%, and the elastic recovery rate is 18%. The fiber can be processed into various textiles by conventional techniques.

Comparative Example 1 After mixing 15 parts of alumina with an average particle size of 1 μm and particles with a particle diameter of 3 μm or more accounting for 5% of the total weight, and polypropylene powder with a melt index of 20, it is directly put into the temperature of 260 ° C. In the screw rod, use the same spinneret and winding speed spinning as in Example 1, the number of broken filaments is greater than 100/hour, and winding is difficult. The use time of the veneer is 6 hours, and the surface of the winding wire is rough, which cannot be used for conventional textile processing.

Comparative Example 2 Dissolve 0.04 part of isopropyl triisostearate and 0.04 part of monoglyceride stearate into 10 milliliters of acetone to make a homogeneous solution, and then add it to an average particle size of 5 μm and a particle diameter of 10 μm The weight of the above particles accounts for 10 parts of the mixture of boron nitride and silicon oxide (the weight ratio is 50:50) in 10 parts of the total weight. After mixing evenly, add 89.92 parts of polypropylene with a melt index of 18 and stir at a high speed. On the Ф30 twin-screw mixing extruder, melt and knead once at 220°C to make pellets, and the pellets are vacuum-dried and used for spinning. Melt spinning under the same process and conditions as in Example 1. The use time of the veneer is 3 hours, and the number of broken wires is more than 90 per hour.

Claims (4)

1. A far-infrared fiber made by adding far-infrared ceramic powder to a fiber-forming polymer. The content of far-infrared ceramic powder accounts for 2 to 50% of the weight of the far-infrared fiber. It is characterized in that it is also added with a spinning aid. The average particle diameter of the ceramic powder is between 0.02-2 μm, preferably between 0.05-1 μm, and the weight of particles with a particle diameter above 2 μm should be less than 10% of the total weight of the powder, preferably less than 5%. 2. The far-infrared fiber according to claim 1, characterized in that said spinning aid is isopropyl triisostearate titanate, r-aminopropyl triethoxysilane, r-methyl Two of acryloyltrimethoxysilane and stearic acid. 3. The far-infrared fiber according to claims 1 and 2, characterized in that the added amount of the spinning aid is 2-9% of the weight of the far-infrared ceramic powder, preferably 4-8%. 4. A method for manufacturing far-infrared fibers according to claims 1, 2 and 3, characterized in that the spinning aid is first dissolved in a dispersant and then mixed with far-infrared ceramic powder; Dispersants are conventional low-boiling organic solvents such as acetone and ethanol.